/*******************************************************************************
 * Copyright 2019 Dell Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 *******************************************************************************/

package concurrent

import "sync"

// Closure defines the signature for the closure to execute concurrently within ExecuteAndAggregateResults.
type Closure func() interface{}

// ExecuteAndAggregateResults handles concurrent execution of []Closure.
func ExecuteAndAggregateResults(closures []Closure) []interface{} {
	var wg sync.WaitGroup
	stream := make(chan interface{})

	var results []interface{}
	for _, closure := range closures {
		wg.Add(1)
		go func(closure func() interface{}) {
			defer wg.Done()
			stream <- closure()
		}(closure)
	}

	go func() {
		wg.Wait()
		close(stream)
	}()

	for result := range stream {
		results = append(results, result)
	}
	return results
}
